A New Simultaneous Anisotropy and Dielectric Correction Algorithm For Lwd Resistivity Measurements

摘要

A correct resistivity measurement is crucial to an accurate formation evaluation. Wireline resistivity measurements are often affected by invasion, shoulder bed properties, and environmental effects, such as borehole size and tool position. Though Logging while Drilling (LWD) resistivity measurements may be affected less by these factors, the use of a high frequency (.4 to 2 MHz) induces other unwanted effects in the LWD resistivity measurements. The most significant effects are due to the dielectric constant and the resistivity anisotropy of the formation. They may affect log response even in homogeneous formations when other effects are small. These two effects can be present simultaneously.